There are many buildings where walls are in danger of moving or collapse
because of inadequate lateral restraint of the wall to floor joists, ceiling
joists or roof structure.The problem can be caused by one or a combination
of several factors. For example:
-A decrease of wall stiffness and resistance to buckling and wind loading,
can occur, with wall tie corrosion or insufficient wall ties installed during
construction.
-Re-roofing using heavier materials would give increased vertical loads
which could exceed the load-carrying capacity of the wall.
-The omission of lateral restraints or their failure in service can magnify
the effects of other contributory causes.

Existing remedial systems involve disturbance of building occupants to provide
access to the floor joists in order to fix bent steel straps to the wall
and the joists.This disruptive and time consuming fixing method causes aggravation
to the building occupant and is therefore unsatisfactory.

THE
BENEFITS

THE
SOLUTION THE SPIT LRT

One standard length-no
site adjustment necessary

Applied from outside
the building no disruption

Simple guide tool
- straight line installation

Self-drilling to
timber - quick and easy to install

Cost effective
- saves labour per tie

Austenitic stainless
steel - no corrosion

Small hole in brickwork
- neat finished appearance

8mm wood screw
thread - high pull out loads and compressive loads

Mac expander -
resists tensile and compressive loads

REDIFIX have desgned and developed a lateral restraint tie system which
is quick and easy to apply from the exterior of the building - no disruption
from the inside is necessary.
The LRT is a solid A2, 300 Series stainless steel self drilling tie which
saves fixing time dramatically. The only drilling is through the brick,
block or masonry external wall with a I 3mm diameter drill. LRT guide tools
are placed in the hole and the tie is driven under power through the guide
tools, self-drilling into the joists.The Mac expander is independently set
in the outer leaf of the brickwork to give a solid, high strength, lateral
restraint to the wall.SPACING DATA
Horizontal centres 600 to 1000 mm or as specified Structural Engineer.

Material
- A2, 300 Series
Austenitic Stainless Steel
Diameter - 8mm x 2.3mm
pitch wood screw thread Pilot drilling point/diameter - 6mm x 2.3rpm pitch
wood screw thread M6 thread on Mac Expander MB thread crimped for resin
version
Length - Standard 1000mm to fix to two joists of maximum 500mm centres
Centres - long version can be manufactured to special order to suit wider
centres, or to fix to three joists where this is required. Total length
of the tie must allow for pilot point (45mm long) to pass right through
innermost joist.

Resin
end version, where an M8 thread with crimped sections provides strong keying
points for BRC3 Resin.The resin is injected into the 13mm hole in the brickwork
after driving the lateral restraint tie into position.

LRTH

Where the outer skin
of brickwork has been removed the LRTH  hexagon nut and washer version,
can be used to restrain the inner skin relative to the joists.The outer
skin is then built using secondary wall ties, such as MAC FRAME CRAMPS.
NOTE:
For walls at right angles to the line of the joists, a timber noggin can
be installed between joists and any of the above varieties used to restrain
the wall to the noggin.The length of tie ordered will depend on the position
of the noggin.
Another variety suitable for fixing to a noggin is the LRTS, provided
with nuts and washers for clamping either side of the noggin.

3.
Using threaded setting tool (TTM6S) and 1/4" square drive adaptor (SDSI4D)
Insert LRT into guide tool(LRTGT)
Note:
Select rotation only on the drill. You must also ensure that the drill has
enough power to drive e.g. Spit 335, Drive through first joist.

4.
Stop drilling machine and remove guide tool. Continue to drive the LRT through
second joist until mechanical expander has entered into the outer leaf of
the wall. Unscrew threaded setting tool off LRT.